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US8441175B2 - Piezoactuator having electrical contact - Google Patents

Piezoactuator having electrical contact Download PDF

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Publication number
US8441175B2
US8441175B2 US13/351,348 US201213351348A US8441175B2 US 8441175 B2 US8441175 B2 US 8441175B2 US 201213351348 A US201213351348 A US 201213351348A US 8441175 B2 US8441175 B2 US 8441175B2
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US
United States
Prior art keywords
piezoactuator
contact pin
continuation
stack
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US13/351,348
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English (en)
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US20120202382A1 (en
Inventor
Reinhard Gabl
Jan-Thorsten Reszat
Markus Laussermayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Epcos AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Assigned to EPCOS AG reassignment EPCOS AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RESZAT, JAN-THORSTEN, LAUSSERMAYER, MARKUS, GABL, REINHARD
Publication of US20120202382A1 publication Critical patent/US20120202382A1/en
Application granted granted Critical
Publication of US8441175B2 publication Critical patent/US8441175B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/872—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • H10N30/883—Additional insulation means preventing electrical, physical or chemical damage, e.g. protective coatings

Definitions

  • the invention relates generally to electronic devices and, in particular embodiments, to a piezoactuator having electrical contact.
  • a valve piston of a control valve is actuated, which serves as an injection valve in a motor vehicle.
  • a piezoactuator is described, for example, in the German patent DE 199 45 933 C1 or International publication WO 2005/035971 A1.
  • a piezoactuator which has high reliability and is suitable for a multiplicity of possible areas of application and installation locations.
  • a piezoactuator of multilayer design wherein piezoelectric layers and electrode layers are arranged alternately one above another to form a stack.
  • the stack expands along the electric field direction resulting from the applied voltage.
  • a piezoactuator of multilayer design is specified, wherein piezoelectric layers and electrode layers are arranged alternately one above another to form a stack.
  • the stack has, for example, four side faces and two end faces.
  • the piezoactuator can be clamped at the end faces, which provides for a mechanical prestress along the longitudinal axis of the stack.
  • the stack comprises a multiplicity of thin films composed of piezoceramic, which may comprise a material such as lead zirconate titanate.
  • a piezoelectric layer can have one or a plurality of these films. Electrode layers are arranged between these layers composed of piezoceramic. Depending on the desired voltage-dependent behavior of the piezoactuator, an electrode layer need not necessarily follow every piezoelectric layer.
  • One possible material for the electrode layer is silver-palladium or copper. This can be applied as a paste to the piezoelectric layer by means of a screen printing method, and the stack can subsequently be sintered.
  • the electrode layers can be applied to the piezoelectric layers continuously or they can only partly cover the cross-sectional area of the piezoelectric layers.
  • the embodiment of the electrical contact-connection of the electrode layers is dependent on whether the electrode layers are arranged continuously on the surface of the piezoelectric layers.
  • a plurality of electrode layers are electrically conductively connected to one contact pin.
  • a continuation can be arranged at the contact pin such that it electrically conductively connects the contact pin and the continuation.
  • the continuation has a contact point with the contact pin.
  • the contact point is designed to electrically conductively connect the continuation to the contact pin.
  • the continuation has a free end provided for establishing an electrical connection.
  • a straight line running through the contact point and the free end of the continuation encloses an angle with the longitudinal axis of the contact pin that is greater than 0° and less than 180°.
  • the contact point for establishing the connection between the continuation and the contact pin is arranged along the stack composed of piezoelectric layers and electrode layers.
  • the contact point is arranged between an upper end and a lower end of the stack.
  • the applied electrode layers lead out from the stack at all side faces thereof.
  • the electrical connection of the electrode layers to the contact pin can be realized, for example, by means of thin wires that individually connect every second electrode layer at a side face of the stack to the contact pin.
  • a continuation can be fitted to the contact pin.
  • the continuation is electrically conductively connected to the contact pin at the position of a contact point.
  • the continuation is fixedly connected to the contact pin, for example, soldered to the latter or fixed to the contact pin by means of an eye fixedly enclosing the contact pin.
  • the continuation comprises, for example, a flexible line wire.
  • the continuation comprises a rigid pin-type element. A combination of these two possibilities would likewise be conceivable.
  • the continuation is fitted to the contact pin.
  • the angle at which the continuation is fitted to the contact pin is intended to be between 0° and 180° with respect to the longitudinal axis of the contact pin.
  • the free end of the continuation can be oriented in a manner pointing outward as seen from the center of the stack. This free end can serve for applying a voltage between the electrode layers and thus, can form an electrical connection of the stack.
  • the electrode layers lead out from the stack alternately at opposite side faces, and a plurality of electrode layers are contact-connected by means of an external electrode fitted laterally to the stack.
  • the electrode layers do not cover the entire area of a piezoelectric layer.
  • the regions of the stack in which adjacent electrode layers do not overlap in the stacking direction are called inactive zones.
  • the regions of the stack in which adjacent electrode layers overlap in the stacking direction are called active zones.
  • Such a construction of the stack allows, for example, all electrode layers which lead out from the stack at the same side to be jointly electrically contact-connected via a common external electrode.
  • the external electrode is produced, for example, by means of a firing paste applied to the outer side of the stack by a screen printing method, and is subsequently sintered with the stack.
  • the contact pin is arranged parallel to the longitudinal axis of the stack.
  • a fixed orientation of the contact pin with respect to the stack also implies a fixed orientation of the continuation with respect to the stack.
  • the angle between the contact pin and the continuation is fixed in this case. This can be very useful in order to set up the position of the free end of the continuation and thus the later electrical connection of the piezoactuator, since only the angle of the continuation with respect to the contact pin has to be taken into account, and not the angle between the continuation and the longitudinal axis of the stack.
  • the contact pin may also have already been prefabricated with a continuation and the resultant component can be fitted to the stack by means of an intermediate element, for example, in a single work step.
  • the orientation of the continuation with respect to the contact pin is already fixed, the orientation of the continuation with respect to the stack is defined in the case of a parallel arrangement between contact pin and stack as well.
  • an electrically conductive intermediate element is arranged between the external electrode and the contact pin, the intermediate element electrically conductively connecting the external electrode and the contact pin.
  • the intermediate element can comprise one or a plurality of individual elements.
  • it can be an elastic component which adapts to the movements of the stack. This prevents a loss of electrical connection between the external electrode and the contact pin and provides for a stable operating capability of the piezoactuator. In particular, it is possible to prevent the tearing away of the connection between contact pin and intermediate element and between intermediate element and external electrode.
  • the electrically conductive intermediate element comprises wires arranged parallel and which electrically conductively connect the external electrode to the contact pin.
  • the parallel wires can be oriented perpendicularly to the longitudinal axis of the stack.
  • a so-called wire harp is used.
  • the latter comprises a plurality of thin, electrically conductive wires.
  • the wire can be soldered to the external electrode and the contact pin.
  • two external electrodes can be fitted to the stack. These external electrodes make contact with the electrode layers alternately.
  • a thin, electrically conductive wire is wound around the stack in a multiplicity of turns. After the wire has been soldered to the external electrodes, the wire connection between the two external electrodes can be severed and the connection can be completely removed. Consequently, the external electrodes are electrically insulated from one another.
  • the straight line running through the contact point between the continuation and the contact pin and the free end of the continuation encloses an angle of 90° with the longitudinal axis of the contact pin.
  • the continuation can be arranged perpendicularly to the contact pin. If the contact pin is also arranged parallel to the longitudinal axis of the stack then the continuation is arranged not only perpendicularly to the contact pin but also perpendicularly to the longitudinal axis of the stack. This orientation is advantageous for a connection of the piezoactuator to a voltage source, since a lateral electrical further contact-connection of the piezoactuator is also possible in this way.
  • the piezoactuator has a housing.
  • the housing can be a potting composed of an elastic material such as silicone, or comprise a potting of this type.
  • the housing encloses at least the side faces of the stack. All other housing forms which do not impede operation of the piezoactuator are also conceivable.
  • a housing can provide protection against environmental influences such as moisture, for example.
  • the contact pin is completely enclosed by the housing.
  • the contact pin is no longer required directly for connecting the stack to a voltage source, it can be expedient to leave the contact pin completely in the housing.
  • a lateral connection is advantageous in some applications since the mechanical contact points situated at the end sides of the stack, for example, are separated from the electrical connections.
  • the continuation projects from a side face of the housing.
  • the continuation is connected to a connection element at a free end, and the piezoactuator can be driven via this connection element.
  • connection element serves for applying an electrical voltage between the electrode layers.
  • the behavior of the stack can be regulated by way of the magnitude of the applied voltage.
  • the connection element can be an attachment onto the continuation. Such an attachment can be applied to each continuation. It is also possible for two attachments to be integrated in a component and to jointly form a connection element.
  • connection element can also be a part of an electrical further contact-connection arranged at the installation location of the piezoactuator.
  • the continuations can be connected to the further contact-connection via a plug connection, for example. Via the further contact-connection, a voltage can be applied to the stack and also regulated.
  • the piezoactuator has two contact pins, and the electrode layers are electrically conductively connected alternately to a respective contact pin.
  • Each of the contact pins has a continuation. Via the free ends of the continuations, a voltage can be applied between adjacent electrode layers.
  • the electrode layers are connected to a contact pin alternately at opposite side faces of the stack.
  • a continuation is fitted to the contact pin.
  • every second electrode layer can be connected to a contact pin by means of a conductive wire. Since a continuation is fitted to the contact pin, an electrically conductive connection between the electrode layers and the continuation is established in this way.
  • Another possibility would be to establish a conductive connection between the electrode layers and the continuation via an external electrode and an intermediate element. This is advantageous particularly for the case where the electrode layers do not cover the entire cross-sectional area of the piezoelectric layer.
  • a voltage can then be applied to the continuations via the connection element.
  • the continuation can be oriented in different ways with respect to the longitudinal axis of the stack.
  • the further contact-connection can be effected with any desired orientation of the continuations with respect to one another.
  • the piezoactuator can be manufactured individually, depending on what orientation of the free ends of the continuations is desired.
  • the free ends of the continuations can be arranged at the same side face of the piezoactuator.
  • the free ends of the continuations can be arranged one above another with respect to the longitudinal axis of the stack.
  • the free ends of the continuations can be arranged at different levels of the stack on the same side face of the piezoactuator or else at different side faces.
  • the free ends of the continuation are arranged alongside one another with respect to the longitudinal axis of the stack.
  • the free ends of the continuations can be arranged at the same level at the same side face of the piezoactuator or at the same level at different side faces of the piezoactuator.
  • the free ends of the continuations are arranged at different side faces of the piezoactuator.
  • FIG. 1 shows a piezoactuator with a contact pin which is connected to the electrode layers via an intermediate element and to which a continuation is fitted;
  • FIG. 2 a shows a cross section through a piezoactuator with two continuations arranged perpendicularly to the longitudinal axis of the stack;
  • FIG. 2 b shows a cross section through a piezoactuator with two continuations which are arranged at opposite sides of the stack;
  • FIG. 3 a shows a side view of the piezoactuator as shown in FIG. 2 a;
  • FIG. 3 b shows a side view of the piezoactuator as shown in FIG. 2 b ;
  • FIG. 3 c shows a side view of a piezoactuator with two continuations arranged one above the other with respect to the longitudinal axis of the piezoactuator.
  • FIG. 1 schematically shows a piezoactuator 10 .
  • the electrode layers 12 are clearly discernible, the electrode layers leading from the stack 16 in an alternating manner in the embodiment illustrated here.
  • An external electrode 20 is fitted to the opposite sides of the stack 16 , only one external electrode 20 being visible in the view used here.
  • a conductive intermediate element 22 formed from thin conductive wires 23 is arranged at the external electrode 20 . These wires 23 arranged parallel to one another connect the external electrode 20 to a rigid contact pin 24 .
  • a continuation 30 consisting of a metallic pin is fixedly soldered to said rigid contact pin 24 .
  • the contact pin 24 is arranged parallel to the longitudinal axis 18 of the stack 16 .
  • the point at which the electrical contact between the continuation 30 and the contact pin 24 is produced is the contact point 32 .
  • the free end 34 of the continuation 30 points in a direction facing away from the stack 16 .
  • FIG. 2 a shows a cross section perpendicular to the longitudinal axis 18 of a piezoactuator 10 with two continuations 30 arranged perpendicularly to the longitudinal axis 18 of the stack 16 .
  • the stack 16 can be seen in the center of the illustration, a respective external electrode 20 being applied to the stack 16 at two mutually opposite side faces 19 .
  • These external electrodes 20 are conductively connected to a respective contact pin 24 via a bent intermediate element 22 .
  • a continuation 30 is electrically conductively soldered to the contact pin 24 .
  • a potting compound 42 is injection-molded around this arrangement and, together with a sleeve 44 , forms the housing 40 of the piezoactuator 10 .
  • the potting compound 42 can comprise an elastic material such as silicone, for example.
  • connection contacts 36 are fitted to the free ends 34 of the continuations 30 , via which connection contacts a voltage is applied to the electrode layers 12 in the piezoactuator 10 .
  • the continuations 30 project from the housing 40 at the same side face 46 .
  • FIG. 2 b shows a similar construction to that in FIG. 2 a with the difference that the continuations 30 project from the housing 40 at opposite side faces 46 of the housing.
  • continuations 30 are arranged alongside one another perpendicularly to the longitudinal axis 18 of the piezoactuator 10 .
  • FIG. 3 c shows a side view of a piezoactuator 10 .
  • the continuations 30 lead out from the housing 40 at the same side face 46 of the housing. In this example, however, they are arranged one above another perpendicularly along the longitudinal axis 18 .

Landscapes

  • Fuel-Injection Apparatus (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
US13/351,348 2009-07-21 2012-01-17 Piezoactuator having electrical contact Expired - Fee Related US8441175B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102009034099.8 2009-07-21
DE102009034099A DE102009034099A1 (de) 2009-07-21 2009-07-21 Piezoaktor mit elektrischer Kontaktierung
DE102009034099 2009-07-21
PCT/EP2010/060491 WO2011009866A1 (fr) 2009-07-21 2010-07-20 Piézoactionneur avec contacts électriques

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/060491 Continuation WO2011009866A1 (fr) 2009-07-21 2010-07-20 Piézoactionneur avec contacts électriques

Publications (2)

Publication Number Publication Date
US20120202382A1 US20120202382A1 (en) 2012-08-09
US8441175B2 true US8441175B2 (en) 2013-05-14

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Application Number Title Priority Date Filing Date
US13/351,348 Expired - Fee Related US8441175B2 (en) 2009-07-21 2012-01-17 Piezoactuator having electrical contact

Country Status (6)

Country Link
US (1) US8441175B2 (fr)
EP (2) EP2799703A1 (fr)
JP (1) JP5717736B2 (fr)
CN (1) CN102472213B (fr)
DE (1) DE102009034099A1 (fr)
WO (1) WO2011009866A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10153419B2 (en) 2014-07-18 2018-12-11 Continental Automotive Gmbh Component for electrically contacting a piezo stack, a piezo stack, and method for producing the same
WO2023161078A1 (fr) * 2022-02-25 2023-08-31 Vermes Microdispensing GmbH Module actionneur doté d'un boîtier isolé hermétiquement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050539A1 (de) * 2008-10-06 2010-04-08 Epcos Ag Piezoaktor mit Außenelektrode
DE102011114194A1 (de) * 2011-09-22 2013-03-28 Epcos Ag Piezoelektrisches Aktorbauelement
WO2013164780A1 (fr) 2012-05-02 2013-11-07 Van Der Walt, Louis, Stephanus Chariot porte-charge et procédé de déchargement d'un chariot porte-charge
DE102013106223A1 (de) * 2013-06-14 2014-12-18 Epcos Ag Vielschichtbauelement mit einer Außenkontaktierung, einer Weiterkontaktierung und einem Verbindungselement

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US4780639A (en) * 1986-05-22 1988-10-25 Nec Corporation Electrostriction effect element
US5438232A (en) * 1991-01-25 1995-08-01 Murata Manufacturing Co., Ltd. Piezoelectric lamination actuator
DE19715487A1 (de) 1997-04-14 1998-10-22 Siemens Ag Piezoelektrischer Aktor mit einem Hohlprofil
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EP1079097A2 (fr) 1999-08-20 2001-02-28 Delphi Technologies, Inc. Boítier d'actionneur
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EP1257006A1 (fr) 2001-05-09 2002-11-13 Tyco Electronics UK Limited Arrangement d'interconnection électrique
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WO2005047689A1 (fr) 2003-11-12 2005-05-26 Siemens Aktiengesellschaft Tapis de mise en contact pour actionneur, et procede de production correspondant
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USRE27116E (en) * 1966-01-05 1971-04-20 Piezoelectric multielement device
US4780639A (en) * 1986-05-22 1988-10-25 Nec Corporation Electrostriction effect element
US5438232A (en) * 1991-01-25 1995-08-01 Murata Manufacturing Co., Ltd. Piezoelectric lamination actuator
DE19715487A1 (de) 1997-04-14 1998-10-22 Siemens Ag Piezoelektrischer Aktor mit einem Hohlprofil
DE19928180A1 (de) 1999-06-19 2001-01-11 Bosch Gmbh Robert Piezoaktor
US6528927B1 (en) * 1999-06-29 2003-03-04 Siemens Aktiengesellschaft Piezo actuator with multi-layer conductive film, and method for making same
DE19932760A1 (de) 1999-07-14 2001-01-18 Bosch Gmbh Robert Brennstoffeinspritzventil
US6474565B1 (en) 1999-07-14 2002-11-05 Robert Bosch Gmbh Fuel injection valve
EP1079097A2 (fr) 1999-08-20 2001-02-28 Delphi Technologies, Inc. Boítier d'actionneur
DE19945933C1 (de) 1999-09-24 2001-05-17 Epcos Ag Piezoaktor mit isolationszonenfreier elektrischer Kontaktierung und Verfahren zu dessen Herstellung
US20040051423A1 (en) * 2000-11-08 2004-03-18 Heinz Florian Piezo-actuator
US20020158552A1 (en) * 2001-02-27 2002-10-31 Shigenobu Nakamura Laminated piezo-electric device
EP1257006A1 (fr) 2001-05-09 2002-11-13 Tyco Electronics UK Limited Arrangement d'interconnection électrique
US20040169438A1 (en) * 2001-06-29 2004-09-02 Dieter Cramer Additional contact for an electric component and piezoelectric component in the form of a multilayer structure
US20070040480A1 (en) * 2003-09-08 2007-02-22 Willibald Schurz Connecting piezoactuator
WO2005035971A1 (fr) 2003-10-14 2005-04-21 Siemens Aktiengesellschaft Actionneur piezoelectrique et procede de production associe
US7564169B2 (en) 2003-10-14 2009-07-21 Siemens Aktiengesellschaft Piezo actuator and associated production method
WO2005047689A1 (fr) 2003-11-12 2005-05-26 Siemens Aktiengesellschaft Tapis de mise en contact pour actionneur, et procede de production correspondant
US7612487B2 (en) 2003-11-12 2009-11-03 Siemens Aktiengesellschaft Contact mat for an actuator, and associated production method
US20060181178A1 (en) * 2004-06-29 2006-08-17 Siemens Ag Piezoelectric component with predetermined breaking point and method for manufacturing and using the component
DE102005039911A1 (de) 2005-08-24 2007-03-08 Robert Bosch Gmbh Anordnung mit einem Piezoaktor
DE102006032743A1 (de) 2006-07-14 2008-01-17 Robert Bosch Gmbh Aktor zum Hubantrieb eines Stellglieds
US8049397B2 (en) * 2006-11-29 2011-11-01 Kyocera Corporation Laminated piezoelectric element, jetting device provided with the laminated piezoelectric element and fuel jetting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10153419B2 (en) 2014-07-18 2018-12-11 Continental Automotive Gmbh Component for electrically contacting a piezo stack, a piezo stack, and method for producing the same
WO2023161078A1 (fr) * 2022-02-25 2023-08-31 Vermes Microdispensing GmbH Module actionneur doté d'un boîtier isolé hermétiquement

Also Published As

Publication number Publication date
CN102472213B (zh) 2015-07-15
DE102009034099A1 (de) 2011-01-27
JP2012533897A (ja) 2012-12-27
JP5717736B2 (ja) 2015-05-13
EP2456970A1 (fr) 2012-05-30
CN102472213A (zh) 2012-05-23
EP2799703A1 (fr) 2014-11-05
US20120202382A1 (en) 2012-08-09
WO2011009866A1 (fr) 2011-01-27

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